From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Design of damper valves and the effectiveness of variable leak over hand control.
| Identifier | ExFiles\Box 99\3\ scan0167 | |
| Date | 15th August 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/APM.2/MH.{M. Huckerby}15.8.39. and Wraith, especially the latter, leaks are used and as a consequence the hand control is very little use. It gives an illusion of control by increasing harshness. From various indicator diagrams that we have taken, including those Figs. 1 and 2, it would seem that a variable leak is the best way of giving the driver a hand control of unquestionable effectiveness. It is also clear that no hand control of any sort can differentiate between pitching and sudden shocks causing harshness, and that only a superior design of damper can deal with this difference. We are developing one or two new types of valve which have this property. With them, a hand control should be superfluous except as a sales point. With modern constant viscosity oils we consider that a variable leak is the best form of hand control. Rm{William Robotham - Chief Engineer}/APM. | ||